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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
Formulation and Characterization of Film Based on Gum Exudates from Brea Tree (Cercidium praecox)
Author(s)
María A. Bertuzzi1 and Aníbal M. Slavutsky2
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DOI:10.17265/2159-5828/2013.03.001
Affiliation(s)
1. Instituto de Investigaciones para la Industria Química (CONICET), CIUNSa, Facultad de Ingeniería, Universidad Nacional de Salta, Salta A4408FVY, Argentina
2. Agencia Nacional de Promoción Científica y Tecnológica (ANPCyT), Instituto de Investigaciones para la Industria Química (CONICET), CIUNSa, Universidad Nacional de Salta, Salta A4408FVY, Argentina
ABSTRACT
In the present study, films and coatings for food applications based on a
gum exudate from Brea tree (Cercidium
praecox) were formulated and the influence of
plasticizer content on their functional properties was evaluated. Brea gum is a renewable resource available in
semi-desert areas, extracted by native people. Films were produced by casting
method and characterized through water vapour permeability, mechanical (tensile
strength and elongation at break), morphological and optical properties.
Glycerol was used as plasticizer. Brea gum films presented good visual aspect,
transparency and amber colour. Microscopic observation showed a dense and
homogeneous structure. Film wettability increased with glycerol content due to
hydrophilic nature of the plasticizer. Solubility of films in water increased
with temperature. Water sorption isotherms of films at 25 °C showed that at high aw (above 0.50), the
film matrix swells altering its structure and properties. Water vapour
permeability remained practically constant up to 20% of glycerol content and
then increases linearly with the plasticizer. The addition of glycerol
decreased the opacity and tensile strength. The best film properties were
obtained at 20% of glycerol concentration.
KEYWORDS
Films, brea gum, mechanical properties, barrier properties, plasticizer effects.
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